These new caches will now include item level 476 items of all materials to fill all slots, along with 450 and 463 rares. Drop rates haven't yet been clarified, but having done a few scenarios the chances of winning blue pieces seem to have drastically increased! The 463 items include a few weapons, so could be a great way to get over the hurdle into raid finder gear levels, if the usual avenues aren't open to you. Also, they're certainly a decent way to get things to disenchant, as the drops don't seem to be particularly tailored to your spec.
Perhaps this will be the boost scenarios need, of course WoW Insider doesn't have access to in-game figures, but they seem not to be something that players are making a great deal of use of, possibly thanks at least in part to the suboptimal rewards. Hopefully, these improvements will make scenarios more useful, and therefore more widely utilized.
Mists of Pandaria is here! The level cap has been raised to 90, many players have returned to Azeroth, and pet battles are taking the world by storm. Keep an eye out for all of the latest news, and check out our comprehensive guide to Mists of Pandaria for everything you'll ever need to know.